304 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
plain cinnamon-rufous or hazel (more or less deep), fading into whitish 
or pale reddish buffy on chin (sometimes all round base of bill) and 
into paler cinnamon-rufous or rufous-whitish on chest, the latter 
(sometimes lower foreneck also) more or less streaked or spotted 
with dusky; rest of under parts, including axillars and most of under 
wing-coverts, white, the -breast (at least laterally) and sides more 
or less streaked and spotted with dusky; hindneck light grayish 
brown, more or less tinged with cinnamon-rufous, and streaked with 
blackish or dusky; scapulars and interscapulars black centrally, 
margined with cinnamon-rufous and dull buffy whitish; wing-coverts 
brownish gray, darker centrally and margined indistinctly with paler, 
the greater coverts tipped with white; primary coverts dusky, the 
proximal ones tipped with white; primaries grayish brown, becoming 
darker distally, the proximal quills narrowly edged with whitish, 
the shafts of all largely white; rump deep brownish gray, the feathers 
narrowly margined with whitish; median upper tail-coverts and 
middle pair of rectrices dusky, the latter with outer webs narrowly 
edged with white, the remaining rectrices pale brownish gray, very 
narrowly and indistinctly edged with white; lateral upper tail-coverts 
white; bill and feet dull black (in dried skins); iris dark brown 
Adult female in swmmer.—Similar to the male and not always 
distinguishable, but usually with the cinnamon-rufous of head, neck, 
etc., slightly less deep. 
Winter plumage.—Above brownish gray or grayish brown, passing 
into white on forehead, the crown and occiput narrowly streaked or 
longitudinally flecked with dusky, the scapulars and interscapulars 
with narrow shaft-streaks of dusky and narrowly and indistinctly 
margined terminally with whitish; wing-coverts (except more 
anterior lesser coverts) with more distinct dusky shaft-streaks and 
broader dull whitish terminal margins; remiges, tail, etc., as in sum- 
mer; under parts, including loral and malar regions, immaculate 
white. 
Young.—Crown and occiput light brown, broadly streaked with 
black; hindneck pale grayish, narrowly and indistinctly streaked with 
darker; interscapulars black, margined with light rusty brown and 
whitish, the scapulars similar but with broader and more whitish 
margins; wing-coverts dusky centrally, broadly but not sharply 
margined with pale buffy grayish or dull whitish, the greater coverts 
tipped with white; tertials dusky, margined with light rusty brown 
and white; primaries as in adults; rectrices (except middle pair) gray 
margined with white and with a median streak of white; forehead 
(to above eyes laterally), lores, rictal and malar regions, and entire 
under parts immaculate white, the sides of chest, however, with a 
few streaks of brownish gray or dusky, and lores with an indistinct 
streak of grayish brown, from eye to bill. 
